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uio: fix dmem_region_start computation 

commit 4d31a2588ae37a5d0f61f4d956454e9504846aeb upstream.

The variable i contains a total number of resources (including
IORESOURCE_IRQ). However, we want the dmem_region_start to point
after the last resource of type IORESOURCE_MEM. The original behaviour
leads (very likely) to skipping several UIO mapping regions and makes
them useless. Fix this by computing dmem_region_start from the uiomem
which points to the last used UIO mapping.

Fixes: 0a0c3b5a24 ("Add new uio device for dynamic memory allocation")

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Jan Viktorin 2016-05-17 11:22:17 +02:00 committed by syphyr
parent f39176835c
commit 1ffe03c4f7
1 changed files with 1 additions and 1 deletions
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2
drivers/uio/uio_dmem_genirq.c
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@ -229,7 +229,7 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
++uiomem;
}
priv->dmem_region_start = i;
priv->dmem_region_start = uiomem - &uioinfo->mem[0];
priv->num_dmem_regions = pdata->num_dynamic_regions;
for (i = 0; i < pdata->num_dynamic_regions; ++i) {